Stretchable OLEDs based on a hidden active area for high fill factor and resolution compensation

Donggyun Lee, Su-Bon Kim, Taehyun Kim, Dongho Choi, Jee Hoon Sim, Woochan Lee, Hyunsu Cho, Jong-Heon Yang, Junho Kim, Sangin Hahn, Hanul Moon () and Seunghyup Yoo ()
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Donggyun Lee: Korea Advanced Institute of Science and Technology (KAIST)
Su-Bon Kim: Korea Advanced Institute of Science and Technology (KAIST)
Taehyun Kim: Korea Advanced Institute of Science and Technology (KAIST)
Dongho Choi: Korea Advanced Institute of Science and Technology (KAIST)
Jee Hoon Sim: Korea Advanced Institute of Science and Technology (KAIST)
Woochan Lee: Korea Advanced Institute of Science and Technology (KAIST)
Hyunsu Cho: Electronics Telecommunications Research Institute (ETRI)
Jong-Heon Yang: Electronics Telecommunications Research Institute (ETRI)
Junho Kim: Korea Advanced Institute of Science and Technology (KAIST)
Sangin Hahn: Korea Advanced Institute of Science and Technology (KAIST)
Hanul Moon: Dong-A University
Seunghyup Yoo: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Stretchable organic light-emitting diodes (OLEDs) have emerged as promising optoelectronic devices with exceptional degree of freedom in form factors. However, stretching OLEDs often results in a reduction in the geometrical fill factor (FF), that is the ratio of an active area to the total area, thereby limiting their potential for a broad range of applications. To overcome these challenges, we propose a three-dimensional (3D) architecture adopting a hidden active area that serves a dual role as both an emitting area and an interconnector. For this purpose, an ultrathin OLED is first attached to a 3D rigid island array structure through quadaxial stretching for precise, deformation-free alignment. A portion of the ultrathin OLED is concealed by letting it ‘fold in’ between the adjacent islands in the initial, non-stretched condition and gradually surfaces to the top upon stretching. This design enables the proposed stretchable OLEDs to exhibit a relatively high FF not only in the initial state but also after substantial deformation corresponding to a 30% biaxial system strain. Moreover, passive-matrix OLED displays that utilize this architecture are shown to be configurable for compensation of post-stretch resolution loss, demonstrating the efficacy of the proposed approach in realizing the full potential of stretchable OLEDs.

Date: 2024
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DOI: 10.1038/s41467-024-48396-w

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